Home / 21,815.32-30,104.32-13,331.63

Finding the Fourth Proportional to 21,815.32, 30,104.32 and 13,331.63

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Solution

The fourth proportional to 21,815.32, 30,104.32 and 13,331.63 is: 18,397.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,815.32 : 30,104.32 = 13,331.63 : x
  2. Step 2: Convert to fraction form
    21,815.32/30,104.32 = 13,331.63/x
  3. Step 3: Cross multiply
    21,815.32x = 30,104.32 × 13,331.63
  4. Step 4: Simplify right side
    21,815.32x = 401,339,655.64
  5. Step 5: Solve for x
    x = 401,339,655.64/21,815.32
  6. Step 6: Final answer
    x = 18,397.15

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.